Effect of IAA on the growth and photosynthetic characteristics of Quercus sessilis at seedling stage

doi:10.3969/j.issn.1000-1565.2022.05.011

Abstract

Abstract: The phenomenon of topping out exists during the growth and development of young Quercus sessilis. In order to investigate the effect of spraying different mass concentrations of the exogenous plant growth regulator indole-3-acetic acid(IAA)on the growth and photosynthetic characteristics- DOI:10.3969/j.issn.1000-1565.2022.05.011IAA对幼苗期夏橡生长及光合特性的影响石海燕¹,张志刚²,李宏²,杨建军¹,李斌³,史开奇³,杨璐^4,5(1.新疆大学生态与环境学院,绿洲生态教育部重点实验室,新疆乌鲁木齐 830017;2.新疆林科院造林治沙研究所,新疆乌鲁木齐 830000;3.伊犁州林木良种繁育试验中心,新疆察布查尔 835311;4.新疆林果树种选育与栽培重点实验室,新疆乌鲁木齐 830000;5.新疆林木资源与利用国家林草局重点实验室,新疆乌鲁木齐 830000)摘要:幼苗期夏橡在生长发育过程中存在封顶现象,为探究外源植物生长调节剂吲哚乙酸(indole-3-acetic acid,IAA)对封顶现象的破除作用,以1年生夏橡播种苗木为研究对象,在夏橡封顶时喷施不同质量浓度的IAA.通过对夏橡生长特性、光合特性的测定,运用最小显著性差异法(least significant difference,LSD)及沃勒-邓肯对比分析在喷施不同质量浓度IAA后幼苗期夏橡生长特性与叶片光合性能的差异,结果表明:喷施IAA提高了夏橡光合特性日变化指标G_s、T_r及C_i,进而提高了植株的净光合速率(P_n),低质量浓度IAA处理下幼苗期夏橡P_n下午峰值提前,高质量浓度处理后光合“午休”现象消失;IAA处理对于延缓P_n下降有一定作用,质量浓度为60 mg/L的IAA处理时P_n最大;IAA处理前期主要受气孔限制,后期以非气孔限制为主.得出结论:IAA的喷施会提高夏橡幼苗的P_n,延缓P_n的下降,此外IAA质量浓度为100~120 mg/L时,破除幼苗期夏橡封顶现象效果最显著.关键词:幼苗期夏橡;封顶现象;IAA;光合特性中图分类号:Q145.1 文献标志码:A 文章编号:1000-1565(2022)05-0519-11Effect of IAA on the growth and photosynthetic characteristics of Quercus sessilis at seedling stageSHI Haiyan¹, ZHANG Zhigang², LI Hong²,YANG Jianjun¹, LI Bin³, SHI Kaiqi³, YANG Lu^4,5(1.Key Laboratory of Oasis Ecology of Education Ministry, College of the Ecology and Environment, Xinjiang University, Urumqi 830017, China; 2.Institute of Afforestation and Sand Control, Xinjiang Academy of Forestry Sciences, Urumqi 830000, China; 3.Yill Trees Variety Breeding Center of Xinjiang Uygur Autonomous Region, Chabchal 835311, China; 4.Key Laboratory of Fruit Tree Species Breeding and Cultivation in Xinjiang, Urumqi 830000, China; 5.Key Laboratory of Forest Resources and Utilization in Xinjiang of National Forestry and Grassland Administration, Urumqi 830000, China)Abstract: The phenomenon of topping out exists during the growth and development of young Quercus sessilis. In order to investigate the effect of spraying different mass concentrations of the exogenous plant growth regulator indole-3-acetic acid(IAA)on the growth and photosynthetic characteristics- 收稿日期:2022-03-25 基金项目:伊犁州林木良种繁育试验中心国家杨树、白榆重点林木良种基地补助项目(202110);新疆林草科技专项(XJLCKJ2022008) 第一作者:石海燕(1998—),女,河北邢台人,新疆大学在读硕士研究生,主要从事生态修复与可持续发展研究. E-mail: shihaiyan_ecology@163.com 通信作者:杨建军(1978—),男,新疆乌苏人,新疆大学副教授,博士,主要从事干旱区水土保持与荒漠化防治研究. E-mail: yjj@xju.edu.cn第5期石海燕等:IAA对幼苗期夏橡生长及光合特性的影响of Q. sessilis, this paper used 1-year-old Q. sessilis sown seedlings as the research object, and IAA sprayed at different mass concentrations when the Q. sessilis were topped out. By measuring the growth characteristics and photosynthetic characteristics of Q. sessilis, the differences in growth characteristics and photosynthetic performance of Q. sessilis leaves at the seedling stage after spraying different concentrations of IAA were compared and analyzed using least significant difference(LSD)and Waller-Duncan comparisons. The results showed that the daily changes of G_s、T_r and C_i in photosynthetic characteristics of Q. sessilis were increased by IAA spraying, which in turn increased the photosynthetic rate(P_n )of the plants, and the afternoon peak of P_n in Q. sessilis at the seedling stage was advanced under the low mass concentration of IAA treatment, and the photosynthetic “lunch break” phenomenon disappeared after the high mass concentration treatment. Which had a certain effect on delaying the decrease of. P_n was maximum at the IAA treatment with a mass concentration of 60 mg/L. The IAA treatment was mainly stomatal-limited in the early stages and non-stomatal-limited in the later stages. It was concluded that the application of IAA increased the P_n of Q. sessilis seedlings and delayed the decrease of P_n. In addition, IAA at a mass concentration of 100~120 mg/L was the most effective in breaking the Q. sessilis topping phenomenon at the seedling stage.

Key words: Quercus sessilis at seedling stage, phenomenon of topping out, IAA, photosynthesis

CLC Number:

Q145.1

SHI Haiyan, ZHANG Zhigang, LI Hong,YANG Jianjun, LI Bin, SHI Kaiqi, YANG Lu. Effect of IAA on the growth and photosynthetic characteristics of Quercus sessilis at seedling stage[J]. Journal of Hebei University(Natural Science Edition), 2022, 42(5): 519-529.

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